VBA 2010: Help with checking a website for changes at a set frequency

Hello,

I'd like to automatically check a website once or twice a day to see if it has been updated with new information. Right now, I am polling the clock as a means to determine elapsed time. I'm told that this results in unnecessary use of the CPU and that I should look into a timer event. I'm unable to determine how to do this in Excel.

Here is the code that I'm using:

Code:

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Public Sub MyTimer(timeinhours)
    Dim N As Date
    N = Now
    Do While DateDiff("s", CDate(N), CDate(Now)) < timeinhours * 3600: DoEvents: Loop    ' Note: return time from Datediff is in seconds.
End Sub

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look into application.ontime